Jambmaths question:

In the diagram above $\left| OR \right|$ is the diameter of the semicircle OR. Find the area of the figure of the shape to the nearest whole number
Option A:
80cm2
Option B:
70cm2
Option C:
90cm2
Jamb Maths Solution:
$\begin{align} & \text{Area of rectangle }PSQR=7\times 10c{{m}^{2}}=70c{{m}^{2}} \\ & \text{Area of semicircle}=\frac{1}{2}{{\left( \frac{22}{7}\times \left( \frac{7}{2} \right) \right)}^{2}}=\frac{77}{4}c{{m}^{2}} \\ & \text{Area of the shape}=70c{{m}^{2}}+\frac{77}{4}c{{m}^{2}}=\frac{280+77}{4}c{{m}^{2}} \\ & =\frac{357}{4}c{{m}^{2}}=89.25c{{m}^{2}} \\ & \text{To the nearest whole number, the area is }89c{{m}^{2}} \\\end{align}$
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